Resin composition and use thereof

Abstract

Disclosed is a resin composition comprising a melt-moldable side chain 1,2-diol-containing PVA-based resin (A), and fluororesin containing a polar functional group capable of reacting with or forming hydrogen bond(s) with hydroxyl group (B). The component (A) and the component (B) have excellent affinity, and therefore if either the component (A) or component (B) becomes matrix, the other can be finely dispersed into the matrix, thus providing a resin composition having excellent gas-barrier property, solvent resistance, and bending fatigue resistance. The present invention also provides emulsified dispersion and binder in which the resin composition is used.

The invention claimed is: 
     
       1. A resin composition comprising:
 (A) polyvinyl alcohol-based resin containing a structural unit represented by the following formula (1), and 
 (B) fluororesin containing a polar functional group capable of reacting with or forming hydrogen bond(s) with a hydroxyl group, which is hereinafter referred to as “polar functional group-containing fluororesin”: 
 
       
         
           
           
               
               
           
         
       
       wherein each of R 1  to R 6  is independently hydrogen or an organic group, and X is a single bond or a binding chain. 
     
     
       2. The resin composition according to  claim 1 , wherein the polar functional group is carbonyl-containing group or hydroxyl group. 
     
     
       3. The resin composition according to  claim 2 , wherein the carbonyl-containing group is at least one selected from the group consisting of carbonate group, haloformyl group, aldehyde group, ketone group, carboxyl group, alkoxycarbonyl group, carboxylic anhydride group, and isocyanate group. 
     
     
       4. The resin composition according to  claim 1 , wherein the (B) polar functional group-containing fluororesin is a copolymer containing at least tetrafluoroethylene as a constituent monomer. 
     
     
       5. The resin composition according to  claim 4 , wherein the (B) polar functional group-containing fluororesin further contains ethylene as a constituent monomer thereof. 
     
     
       6. The resin composition according to  claim 5 , wherein the (B) fluororesin constituting the polar functional group-containing fluororesin is one selected from the group consisting of ethylene/tetrafluoroethylene-based copolymer, ethylene/tetrafluoroethylene/hexafluoropropylene-based copolymer, ethylene/tetrafluoroethylene/CH 2 ═CH—Rf based copolymer wherein Rf is perfluoroalkyl group having from 2 to 6 carbon atoms, and ethylene/tetrafluoroethylene/hexafluoropropylene/CH 2 ═CH—Rf based copolymer wherein Rf is perfluoroalkyl group having from 2 to 6 carbon atoms. 
     
     
       7. The resin composition according to  claim 1 , wherein the polar functional group-containing fluororesin has a melting point of 120 to 220° C. 
     
     
       8. The resin composition according to  claim 1 , wherein the content mass ratio (A/B) of the (A) polyvinyl alcohol-based resin to the (B) polar functional group-containing fluororesin is in the range of 98/2 to 2/98. 
     
     
       9. A pellet produced by melt-kneading a resin composition comprising
 (A) polyvinyl alcohol-based resin containing a structural unit represented by the following formula (1), and (B) fluororesin containing a polar functional group capable of reacting with or forming hydrogen bond(s) with hydroxyl group (hereinafter called as “polar functional group-containing fluororesin”): 
 
       
         
           
           
               
               
           
         
         wherein each of R 1  to R 6  is independently hydrogen or an organic group, and X is single bond or a binding chain. 
       
     
     
       10. A producing method of a resin composition comprising
 (A) polyvinyl alcohol-based resin containing a structural unit represented by the following formula (1), and (B) fluororesin containing a polar functional group capable of reacting with or forming hydrogen bond(s) with hydroxyl group wherein each of R 1  to R 6  is independently hydrogen or an organic group, and X is single bond or a binding chain, 
 
       
         
           
           
               
               
           
         
         comprising a process of melt-kneading the (A) polyvinyl alcohol-based resin with the (B) polar functional group-containing fluororesin. 
       
     
     
       11. An emulsified dispersion comprising
 (A) polyvinyl alcohol-based resin containing a structural unit represented by the following formula (1); 
 (B) fluororesin containing a polar functional group capable of reacting with or forming hydrogen bond(s) with hydroxyl group; and 
 a dispersion medium dissolving or uniformly miscible with the (A) polyvinyl alcohol-based resin, 
 
       
         
           
           
               
               
           
         
         wherein each of R 1  to R 6  is independently hydrogen or an organic group, and X is single bond or a binding chain. 
       
     
     
       12. A binder comprising an emulsified dispersion according to  claim 11 . 
     
     
       13. The binder according to  claim 12 , being used for a lithium-ion secondary battery electrode. 
     
     
       14. The resin composition according to  claim 1 , wherein the content mass ratio (A/B) of the (A) polyvinyl alcohol-based resin to the (B) polar functional group-containing fluororesin is in the range of 98/2 to 30/70. 
     
     
       15. The emulsified dispersion according to  claim 11 , wherein the content mass ratio (A/B) of the (A) polyvinyl alcohol-based resin to the (B) polar functional group-containing fluororesin is in the range of 95/5 to 55/45.